TI-55

TI-55
Type Programmable
Manufacturer Texas Instruments
Introduced 1977
Discontinued 1977
Calculator
Precision Calculator Precision
Display Type Light-emitting diode
Display Size 8+2
CPU
Processor TI TMC1503NL
Programming
Other
Power supply Power supply
Weight 0.18 kg
Dimensions 145*80*33

The TI-55 is a programmable calculator first manufactured by Texas Instruments in 1977. It had an LED display,[1] and weighed 6.4 ounces (180 grams). It was programmable to hold up to 32 key-codes that would allow the user to repeat simple calculations with different values.[2]

TI-55 II

The TI-55 II with LCD was introduced in 1981, but, like many other Texas Instruments calculators of this time, suffered from serious keyboard reliability problems. Several variants of the TI-55 II exist.

TI-55 III

The TI-55 III replaced the TI-55 II in the USA in 1986. It featured a redesigned keyboard mechanics, thereby eliminating the common "bouncing keys" fault of prior models. Several variants of the TI-55 III exist.

TI-56

The TI-56 was a European variant of the TI-55 III manufactured since 1986. It was also offered free of charge in exchange of faulty Texas Instruments calculators of a similar class like the TI-54 in Europe in 1986.

References